Dust sensor



FIG. 1.1 is a perspective view of a dust sensor showing our new design;

FIG. 1.2 is a front view thereof;

FIG. 1.3 is a rear view thereof;

FIG. 1.4 is a left side view thereof;

FIG. 1.5 is a right side view thereof;

FIG. 1.6 is a top plan view thereof; and,

FIG. 1.7 is a bottom plan view thereof. 

CLAIM The ornamental design for a dust sensor, as shown and described. 